4. There are some difficult tests in a course in such a way that no participant got an "A" on every test. What is the logical representation of the above sentence in first order logic? [10 points]

You can assume that: p = a participant

t = a test Participant(p) = participate in the course Test(t) = taking a test Get_A(p,t) = participant gets an "A" in a test

5. There is a record in an agent's knowledge base stating that: " if A happens then B happens and if A does not happen then C will happen, and C does not happen". What entailment can be made considering the record in the knowledge base. [15 points]

6. What is the CNF of X (Y Z)? [20 points]